Improvement in saw-mills



W. B. BURNS.

SAWMILL. No. 34,942. PATENTED APR. 15, 1862.

UNITED STATES PATENT OFFICE.

VILLIAM B. BRNS, OF EAST SAGINAIV, MICHIGAN.

IMPROVEMENT IN SAW-MILLS.

Specification forming part of Letters Patent No. 34,942, dated April 15, 1862.

vT0 all whom t may concern.-

Be it known that I, WILLIAM B. BURNS, of East Saginaw, in the county of Saginaw and State of Michigan, have invented a new and useful Improvement in Saw-Mills; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a vertical section of my invention, taken in the line Fig. 2; Fig. 2,a vertical section of the same, taken in the line -fy y, Fig. 1; Fig. 3, a detached vertical section of the saw-gate, taken in the line e e', Fig. l. i

Similar letters of reference indicate corresponding parts in all the figures.

This invention relates to an improvement in that class of saw-mills or sawing-lnachines which are provided with reciprocating saws and designed for sawing lumber direct from the rough log.

The object of the invention is to obtain a machine of the class specified which will admit of two logs being sawed simultaneously, one at each side of the saw gate or sash, so that the superior and indifferent qualities of stuff contained in each log may be sawed therefrom and kept assorted or separate from each other, and stuit of different thicknesses also sawed from one and the same log by a plurality' of saws.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the framing of the sawmill or sawing-machine, B B being the uprights on the same, one at each side, and connected at their upper ends by a cross-tie C.

D D are two vertical rods, which are permanently secured in the framing A, and serve as guides for the saw sash or gate E, which is of rectangular form and has eyes F attached to its back part through which the rods D D pass. The eyes F are allowed to slide freely up and down on the rods D D.

The sash or gate E is composed of four parts G G H H. The parts G G are vertical rods, to the upper and lower ends of which the parts H H are respectively attached, the

latter-named parts being the cross-pieces and forming gibs to receive or hold the saws. These cross-pieces or gibs are each formed of two parallel vertical plates .d o1, between which the ends of the rods G G are fitted, and secured by bolts b, the ends of said rods being made square or formed with plain parallel surfaces at their front and back sides, so as to have good bearing-surfaces for the plates cna. and to keep them at a proper distance apart, the lower edges of the plates a resting or bearing against shoulders o on rods G.

The gibs or cross-pieces H I-I project considerably beyond each rod G, as shown clearly in Fig. 1, and to these outer portions of the gibs or cross-pieces the saws I are secured, as follows: The upper ends of the saws have each a metal strap CZ attached, and these straps pass up between the plates a a of the upper gib or cross-piece H, and have keys` or wedges e inserted in their upper ends, the keys or wedges bearing on the upper edges of the plates a a. The lower ends of the saws I are each provided with a metal strap f, the lower parts of which are made in the form of a hook, as shown clearly in Fig. 3," and these hooks catch into hookformed plates .I J, which are permanently secured in the lower gib or cross-piece H The plates J J eX- tend the whole length of the portion of the gib or cross-piece II which projects beyond the rods G G, as shown in Fig. 1. By this arrangement ormode of securing the saws in the sash or gate E it will be seen that the saws may be readily shifted to saw stuff of different thicknesses; and it will also be seen that two logs will be sawed simultaneously, one at each side of the sash or gate, the log at one side beingpreviously sawed at the oppositev side, so that the rough or inferior parts may be kept separate from the superior parts of the log.

The way in which the saw gate or sash is constructed renders it extremely strong and durable, as the strain to which it is subjected is at the outer side of the rods G G, acarriage `L being at each side of the-saw-gate to receive a log. (See Fig. 1.)

The saw gate or sash may be driven by a crank and pitman in the usual way.

H aving thus described Vmy invention, what I adjustable gang-saws I, placed at eaoh side of claim as new, and desire to secure by Letters the gate and fitted in the gibs, as shown, Patent, isfor the purpose herein set forth.

The Vertical rods G G and gibs or. eross- WILLIAM. B. BURNS. pieces H H', connected and arranged, as Witnesses: shown, to form the saw gate or sash, in eom- H. JOSLIN,

bination with the two carriages L L, and the B. EGLESTON. 

